[CA] [CA11] Older A57D water temp

[Chuck - Raymarine - Moderator]

Rick,

As the P58 features a temperature thermistor, this transducer has been selected within the MFD's Fishfinder settings, please additionally be certain set the Speed Transducer selection to UNKNOWN. Should the Sea Temp data item remain dashed thereafter, then it would indicate a fault within the transducer or within the fishfinder circuitry of the A57D itself. As indicated within the FAQ found here, the transducer's thermistor may be tested by measuring its resistance. The schematic for the A57D is shown below (resistance measured across the ground and thermistor pins:



Unfortunately, Raymarine can no longer service A-Series Classic MFDs. Should no fault be found with the transducer and this data item be critical, then it would be necessary to replace the MFD. In this case, it would be recommended that an Axiom 7 DV MFD and an A80484 Adapter Cable for the P58 transducer be used to replace an A50D/A57D/A70D MFD.